CN109611520B - Continuously variable transmission system for electrically driven vehicle - Google Patents
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- CN109611520B CN109611520B CN201811645331.5A CN201811645331A CN109611520B CN 109611520 B CN109611520 B CN 109611520B CN 201811645331 A CN201811645331 A CN 201811645331A CN 109611520 B CN109611520 B CN 109611520B
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- 230000005540 biological transmission Effects 0.000 title claims description 130
- 230000001105 regulatory effect Effects 0.000 claims abstract description 152
- 230000007246 mechanism Effects 0.000 claims abstract description 120
- 230000008859 change Effects 0.000 claims abstract description 50
- 239000003921 oil Substances 0.000 claims description 305
- 239000010720 hydraulic oil Substances 0.000 claims description 73
- 230000009467 reduction Effects 0.000 claims description 29
- 238000004804 winding Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 15
- 238000005461 lubrication Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009194 climbing Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000001050 lubricating effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
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Abstract
The invention discloses a stepless speed change system for an electrically driven vehicle, which comprises a stepless speed change mechanism and a hydraulic actuating system for adjusting the speed change ratio of the stepless speed change mechanism. The stepless speed change mechanism comprises a driving belt pulley, a driven belt pulley and a driving belt arranged on the driving belt pulley and the driven belt pulley; the hydraulic execution system comprises an oil pump, a first pressure oil way and a second pressure oil way; the first pressure oil way and the second pressure oil way are connected with the oil pump, a first pressure regulating valve for regulating the oil pressure is arranged in the first pressure oil way, and a second pressure regulating valve for regulating the oil pressure is arranged in the second pressure oil way. According to the stepless speed change system for the electric drive vehicle, the hydraulic execution system is arranged to realize the speed change ratio adjustment of the stepless speed change mechanism, so that the whole stepless speed change system can realize high efficiency and energy conservation, the cost of the whole vehicle application is reduced, the low-speed dynamics and climbing performance of the whole vehicle can be improved, and the energy consumption utilization rate of the whole vehicle can be improved.
Description
Technical Field
The invention belongs to the technical field of transmissions, and particularly relates to a continuously variable transmission system for an electrically driven vehicle.
Background
The typical electric drive vehicle transmission system consists of a fixed speed ratio reduction gear, motor power is directly transmitted to wheels through the reduction gear, torque and rotating speed cannot be adjusted through a speed reducer to adapt to vehicle running, and in order to meet the low-speed large-torque requirement and the high-vehicle-speed running requirement of the whole vehicle, the current electric drive vehicle meets the requirement of the whole vehicle by improving the torque and the rotating speed of the motor.
Although the current electric drive system can basically meet the use requirement of the whole vehicle, the current system has larger limitation, such as obviously lower power performance and highest vehicle speed compared with the traditional vehicle, and high pure electric consumption, and meanwhile, the whole vehicle has higher cost and the problem of vibration noise caused by high-rotating-speed running of the motor is outstanding. To solve a series of disadvantages of a single-stage reduction gear system, patent document CN104534037a discloses a two-gear automatic transmission for an electrically driven vehicle, which includes an input shaft, an intermediate shaft, a first spur gear pair, a second spur gear pair, a third spur gear pair, a first torque transmission device, a second torque transmission device, a planetary gear transmission device, and a differential assembly. Compared with a single-stage speed reducer, the scheme has the advantages that one gear is added, and the dynamic property and the electricity consumption performance of the original electric driving system are effectively improved; however, as only two gears are provided, the motor efficiency and the torque cannot be exerted to the maximum extent, the power performance and the electricity consumption performance of the pure electric vehicle cannot be exerted to the maximum level, and meanwhile, as the motor rotation speed is suddenly changed in a large range in the two gear switching process, the impact of the whole vehicle can be generated, and the driving comfort of the whole vehicle is affected. Therefore, there is a need for a continuously variable transmission system for an electrically driven vehicle that has a more improved function, lower power consumption, and higher driving comfort.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a stepless speed change system for an electrically driven vehicle, and aims to improve the energy consumption utilization rate of the whole vehicle.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a continuously variable transmission system for an electrically driven vehicle, comprising:
The stepless speed change mechanism comprises a driving belt pulley, a driven belt pulley and a driving belt arranged on the driving belt pulley and the driven belt pulley; and
A hydraulic actuator system including an oil pump, a first pressure oil passage for guiding hydraulic oil to the drive pulley and for adjusting a groove width of the drive pulley, and a second pressure oil passage for guiding hydraulic oil to the driven pulley and for adjusting a groove width of the driven pulley; the first pressure oil way and the second pressure oil way are connected with the oil pump, a first pressure regulating valve for regulating the oil pressure is arranged in the first pressure oil way, and a second pressure regulating valve for regulating the oil pressure is arranged in the second pressure oil way.
The first pressure regulating valve is a two-position three-way electromagnetic valve.
The second pressure regulating valve is a two-position three-way electromagnetic valve.
The hydraulic execution system further includes a cooling and lubrication oil passage that is connected to the first pressure regulating valve and the second pressure regulating valve and that guides hydraulic oil to a specified component to cool and lubricate the specified component.
The first pressure oil passage is provided with a first oil pressure sensor for detecting oil pressure.
And a second oil pressure sensor for detecting oil pressure is arranged in the second pressure oil path.
The continuously variable transmission system for an electrically driven vehicle further includes:
and the power transmission mechanism is used for realizing power transmission between the driving motor and the stepless speed change mechanism.
The power transmission mechanism comprises a first gear connected with the driving motor and a second gear meshed with the first gear and connected with the stepless speed change mechanism.
The continuously variable transmission system for an electrically driven vehicle further includes:
and a power transmission mechanism for effecting power transmission between the continuously variable transmission mechanism and the reduction mechanism.
The power transmission mechanism includes a first gear connected with the continuously variable transmission mechanism and a second gear meshed with the first gear and connected with the speed reduction mechanism.
According to the stepless speed change system for the electric drive vehicle, the hydraulic execution system is arranged to realize the speed change ratio adjustment of the stepless speed change mechanism, so that the whole stepless speed change system can realize high efficiency and energy saving, the cost of the whole vehicle application is reduced, the low-speed power performance and the climbing performance of the whole vehicle can be improved, the energy consumption utilization rate of the whole vehicle can be improved, the motor does not need to work in a high-speed area, the vibration noise problem of the electric drive system caused by the high-speed work of the motor can be greatly improved, and the cost of the drive motor and the electric control system can be greatly reduced by reducing the requirement of the whole vehicle on the high-speed work of the motor.
Drawings
The present specification includes the following drawings, the contents of which are respectively:
FIG. 1 is a schematic structural view of a first embodiment;
FIG. 2 is a schematic diagram of the structure of a second embodiment;
FIG. 3 is a schematic structural view of a third embodiment;
Marked in the figure as: 1. a driving motor; 2. a driving belt wheel; 3. a transmission belt; 4. a driven pulley; 5. a reduction drive gear; 6. a reduction driven gear; 7. an oil pump; 8. a second oil pressure sensor; 9. cooling and lubricating oil paths; 10. a second pipeline; 11. a second gear; 12. a second pressure regulating valve; 13. a main oil path; 14. a first pressure regulating valve; 15. a first pipeline; 16. a first oil pressure sensor; 17. a first gear.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.
Example 1
As shown in fig. 1, the present embodiment provides a continuously variable transmission system for an electrically driven vehicle, including a continuously variable transmission mechanism and a hydraulic actuator system for adjusting a gear ratio of the continuously variable transmission mechanism. The continuously variable transmission mechanism comprises a driving belt pulley 2, a driven belt pulley 4 and a circular driving belt 3 which is arranged on the driving belt pulley 2 and the driven belt pulley 4; the hydraulic actuator system includes an oil pump 7, a first pressure oil path for guiding hydraulic oil to the driving pulley 2 and for adjusting the pulley groove width of the driving pulley 2, and a second pressure oil path for guiding hydraulic oil to the driven pulley 4 and for adjusting the pulley groove width of the driven pulley 4; the first pressure oil passage and the second pressure oil passage are connected to the oil pump 7, a first pressure regulating valve 14 for regulating the oil pressure is provided in the first pressure oil passage, and a second pressure regulating valve 12 for regulating the oil pressure is provided in the second pressure oil passage.
As shown in fig. 1, the continuously variable transmission mechanism is a belt type continuously variable transmission, one end of a transmission belt 3 is wound on a driving pulley 2, the other end of the transmission belt 3 is wound on a driven pulley 4, the driving pulley 2 of the continuously variable transmission mechanism is connected with a driving motor 1, the driving pulley 2 receives power generated by the driving motor 1, the driven pulley 4 is connected with a differential mechanism through a speed reducing mechanism, the speed reducing mechanism plays a role in reducing and increasing moment, the speed reducing mechanism is a primary gear mechanism and realizes power transmission, and the speed reducing mechanism comprises a speed reducing driving gear 5 coaxially arranged with the driven pulley 4 and a speed reducing driven gear 6 fixedly arranged on a shell of the differential mechanism and meshed with the speed reducing driving gear 5. The driving motor 1 outputs power generated by the driving motor 1 to wheels through a stepless speed change mechanism, a speed reduction mechanism and a differential mechanism in the driving process of the driving vehicle, stepless speed regulation can be realized through the stepless speed change mechanism, the torque of the driving motor is amplified by the stepless speed change mechanism at a large transmission ratio and then output to the wheels to improve the low-speed power performance of the whole vehicle when the driving vehicle is in low speed, meanwhile, the rotating speed output of the motor is reduced by the stepless speed change mechanism at a lower transmission ratio when the driving vehicle is in medium-high speed, so that the motor can work in a medium-low speed high-efficiency area.
As shown in fig. 1, the speed ratio of the continuously variable transmission mechanism is adjusted by a hydraulic actuator system which supplies hydraulic oil to the driving pulley 2 and the driven pulley 4 to adjust the groove widths of the driving pulley 2 and the driven pulley 4, thereby increasing or decreasing the winding radius of the transmission belt 3 and adjusting the speed ratio. For the driving belt wheel 2, after hydraulic oil enters the driving belt wheel 2, the groove width of a belt groove of the driving belt wheel 2 is reduced under the action of hydraulic pressure, and the winding radius of the driving belt 3 is increased; with the driven pulley 4, when hydraulic oil enters the driven pulley 4, the groove width of the pulley groove of the driven pulley 4 is reduced and the winding radius of the transmission belt 3 is increased by the hydraulic force. The speed change ratio of the continuously variable transmission is adjusted by continuously changing the winding radius of the transmission belt 3.
As shown in fig. 1, the first pressure regulating valve 14 is a two-position three-way electromagnetic valve, which has an oil inlet, an oil outlet and an oil return port, the first pressure oil path further includes a first pipe 15 connected to the first pressure regulating valve 14 and the driving pulley 2, the first pressure regulating valve 14 is used for regulating the oil pressure of the first pipe 15, one end of the first pipe 15 is connected to the oil outlet of the first pressure regulating valve 14, the other end of the first pipe 15 is connected to the driving pulley 2, the oil pump 7 is connected to the oil inlet of the first pressure regulating valve 14 through the main oil path 13, the hydraulic oil pumped by the oil pump 7 enters the first pressure regulating valve 14 through the main oil path 13, and the oil pump 7 is an electric oil pump. When the oil inlet and the oil outlet of the first pressure regulating valve 14 are in a communication state, the oil return port is closed, hydraulic oil entering the first pressure regulating valve 14 flows out of the oil outlet, and the hydraulic oil enters the driving belt wheel 2 through the first pipeline 15; when the oil return port of the first pressure regulating valve 14 is in a communication state with the oil outlet, the oil inlet is closed, hydraulic oil in the driving belt pulley 2 enters the first pressure regulating valve 14 through the first pipeline 15, the hydraulic oil entering the first pressure regulating valve 14 flows out of the oil return port, the driving belt pulley 2 discharges oil, the groove width of a belt groove of the driving belt pulley 2 is increased, and the winding radius of the driving belt 3 is reduced.
As shown in fig. 1, the second pressure regulating valve 12 is also a two-position three-way electromagnetic valve, which has an oil inlet, an oil outlet and an oil return port, the second pressure oil path further includes a second pipe 10 connected to the second pressure regulating valve 12 and the driven pulley 4, the second pressure regulating valve 12 is used for regulating the oil pressure of the second pipe 10, one end of the second pipe 10 is connected to the oil outlet of the second pressure regulating valve 12, the other end of the second pipe 10 is connected to the driven pulley 4, the oil pump 7 is connected to the oil inlet of the second pressure regulating valve 12 through a main oil path 13, and the hydraulic oil pumped by the oil pump 7 enters the second pressure regulating valve 12 through the main oil path 13. When the oil inlet and the oil outlet of the second pressure regulating valve 12 are in a communication state, the oil return port is closed, hydraulic oil entering the second pressure regulating valve 12 flows out of the oil outlet, and the hydraulic oil enters the driven belt pulley 4 through the second pipeline 10; when the oil return port of the second pressure regulating valve 12 is in a communication state with the oil outlet, the oil inlet is closed, hydraulic oil in the driven pulley 4 enters the second pressure regulating valve 12 through the second pipeline 10, the hydraulic oil entering the second pressure regulating valve 12 flows out from the oil return port, the driven pulley 4 discharges oil, the groove width of a pulley groove of the driven pulley 4 is increased, and the winding radius of the driving belt 3 is reduced.
As shown in fig. 1, the hydraulic actuator system further includes a cooling and lubrication oil passage 9 connected to the first pressure regulating valve 14 and the second pressure regulating valve 12 and through which hydraulic oil is guided to the specified components for cooling and lubricating the specified components, the cooling and lubrication oil passage 9 being connected to an oil return port of the first pressure regulating valve 14 and an oil return port of the second pressure regulating valve 12, hydraulic oil flowing out of the driving pulley 2 and the driven pulley 4 being introduced into the cooling and lubrication oil passage 9 through the first pressure regulating valve 14 and the second pressure regulating valve 12, respectively, the hydraulic oil being guided to the specified components by the cooling and lubrication oil passage 9 for cooling and lubricating the components.
As shown in fig. 1, a first oil pressure sensor 16 for detecting oil pressure is provided in the first pressure oil passage, the first oil pressure sensor 16 is mounted on the first pipe 15, a second oil pressure sensor 8 for detecting oil pressure is provided in the second pressure oil passage, and the second oil pressure sensor 8 is mounted on the second pipe 10. Therefore, in order to ensure accurate control of the oil pressure of the first pressure oil path and the second pressure oil path, oil pressure sensors are respectively arranged on the two oil paths and used for detecting actual pressure in real time and ensuring accurate control of the pressure of the driving belt pulley 2 and the driven belt pulley 4.
In the present embodiment, the oil pressure is output to the main oil passage 13 through the electric oil pump 7 to be respectively output to the two pressure regulating valves, and the pressure oil passage pressures of the driving pulley 2 and the driven pulley 4 are controlled by controlling the pressure regulating valves, so that the meshing radii of the driving pulley 2 and the driven pulley 4 with the transmission belt 3 are continuously changed, that is, the change of the cone pulley axial positions of the driving pulley 2 and the driven pulley 4 by changing the pressures is realized, and the change of the transmission ratio is realized, that is, the stepless speed change is realized.
Example two
As shown in fig. 2, the present embodiment provides a continuously variable transmission system for an electrically driven vehicle, including a continuously variable transmission mechanism, a power transmission mechanism, and a hydraulic actuator system for adjusting a gear ratio of the continuously variable transmission mechanism. The continuously variable transmission mechanism comprises a driving belt pulley 2, a driven belt pulley 4 and a circular driving belt 3 which is arranged on the driving belt pulley 2 and the driven belt pulley 4; the hydraulic actuator system includes an oil pump 7, a first pressure oil path for guiding hydraulic oil to the driving pulley 2 and for adjusting the pulley groove width of the driving pulley 2, and a second pressure oil path for guiding hydraulic oil to the driven pulley 4 and for adjusting the pulley groove width of the driven pulley 4; the first pressure oil passage and the second pressure oil passage are connected to the oil pump 7, a first pressure regulating valve 14 for regulating the oil pressure is provided in the first pressure oil passage, and a second pressure regulating valve 12 for regulating the oil pressure is provided in the second pressure oil passage. The power transmission mechanism is used for realizing power transmission between the driving motor 1 and the stepless speed change mechanism, and is connected with the driving motor 1 and the stepless speed change mechanism.
As shown in fig. 2, the continuously variable transmission mechanism is a belt type continuously variable transmission, one end of a transmission belt 3 is wound on a driving pulley 2, the other end of the transmission belt 3 is wound on a driven pulley 4, the driving pulley 2 of the continuously variable transmission mechanism is connected with a driving motor 1 through a power transmission mechanism, the power transmission mechanism receives power generated by the driving motor 1, the driving pulley 2 receives power transmitted by the power transmission mechanism, the driven pulley 4 is connected with a differential through a speed reducing mechanism, the speed reducing mechanism plays a role in reducing and increasing moment, the speed reducing mechanism is a primary gear mechanism, the power transmission is realized, and the speed reducing mechanism comprises a speed reducing driving gear 5 coaxially arranged with the driven pulley 4 and a speed reducing driven gear 6 fixedly arranged on a shell of the differential and meshed with the speed reducing driving gear 5. In the driving process of the driving motor 1, the power generated by the driving motor 1 is output to wheels through a power transmission mechanism, a stepless speed change mechanism, a speed reducing mechanism and a differential mechanism, stepless speed regulation can be realized through the stepless speed change mechanism, the low-speed dynamic performance of the whole vehicle is improved by enabling the stepless speed change mechanism to work in a large transmission ratio and then outputting the amplified driving motor torque to the wheels when the driving motor 1 is in low speed, meanwhile, the motor rotation speed output is reduced by enabling the stepless speed change mechanism to work in a lower transmission ratio when the driving motor is in medium-high speed, so that the motor can work in a medium-low rotation speed high-efficiency area.
As shown in fig. 2, in the same manner as in the first embodiment, the speed ratio of the continuously variable transmission mechanism is adjusted by a hydraulic actuator system that supplies hydraulic oil to the driving pulley 2 and the driven pulley 4 to adjust the groove widths of the driving pulley 2 and the driven pulley 4, thereby increasing or decreasing the winding radius of the transmission belt 3 and further adjusting the speed ratio. For the driving belt wheel 2, after hydraulic oil enters the driving belt wheel 2, the groove width of a belt groove of the driving belt wheel 2 is reduced under the action of hydraulic pressure, and the winding radius of the driving belt 3 is increased; with the driven pulley 4, when hydraulic oil enters the driven pulley 4, the groove width of the pulley groove of the driven pulley 4 is reduced and the winding radius of the transmission belt 3 is increased by the hydraulic force. The speed change ratio of the continuously variable transmission is adjusted by continuously changing the winding radius of the transmission belt 3.
As shown in fig. 2, the first pressure regulating valve 14 is a two-position three-way electromagnetic valve, which has an oil inlet, an oil outlet and an oil return port, the first pressure oil path further includes a first pipe 15 connected to the first pressure regulating valve 14 and the driving pulley 2, the first pressure regulating valve 14 is used for regulating the oil pressure of the first pipe 15, one end of the first pipe 15 is connected to the oil outlet of the first pressure regulating valve 14, the other end of the first pipe 15 is connected to the driving pulley 2, the oil pump 7 is connected to the oil inlet of the first pressure regulating valve 14 through the main oil path 13, the hydraulic oil pumped by the oil pump 7 enters the first pressure regulating valve 14 through the main oil path 13, and the oil pump 7 is an electric oil pump. When the oil inlet and the oil outlet of the first pressure regulating valve 14 are in a communication state, the oil return port is closed, hydraulic oil entering the first pressure regulating valve 14 flows out of the oil outlet, and the hydraulic oil enters the driving belt wheel 2 through the first pipeline 15; when the oil return port of the first pressure regulating valve 14 is in a communication state with the oil outlet, the oil inlet is closed, hydraulic oil in the driving belt pulley 2 enters the first pressure regulating valve 14 through the first pipeline 15, the hydraulic oil entering the first pressure regulating valve 14 flows out of the oil return port, the driving belt pulley 2 discharges oil, the groove width of a belt groove of the driving belt pulley 2 is increased, and the winding radius of the driving belt 3 is reduced.
As shown in fig. 2, the second pressure regulating valve 12 is also a two-position three-way electromagnetic valve, which has an oil inlet, an oil outlet and an oil return port, the second pressure oil path further includes a second pipe 10 connected to the second pressure regulating valve 12 and the driven pulley 4, the second pressure regulating valve 12 is used for regulating the oil pressure of the second pipe 10, one end of the second pipe 10 is connected to the oil outlet of the second pressure regulating valve 12, the other end of the second pipe 10 is connected to the driven pulley 4, the oil pump 7 is connected to the oil inlet of the second pressure regulating valve 12 through a main oil path 13, and the hydraulic oil pumped by the oil pump 7 enters the second pressure regulating valve 12 through the main oil path 13. When the oil inlet and the oil outlet of the second pressure regulating valve 12 are in a communication state, the oil return port is closed, hydraulic oil entering the second pressure regulating valve 12 flows out of the oil outlet, and the hydraulic oil enters the driven belt pulley 4 through the second pipeline 10; when the oil return port of the second pressure regulating valve 12 is in a communication state with the oil outlet, the oil inlet is closed, hydraulic oil in the driven pulley 4 enters the second pressure regulating valve 12 through the second pipeline 10, the hydraulic oil entering the second pressure regulating valve 12 flows out from the oil return port, the driven pulley 4 discharges oil, the groove width of a pulley groove of the driven pulley 4 is increased, and the winding radius of the driving belt 3 is reduced.
As shown in fig. 2, the hydraulic actuator system further includes a cooling and lubrication oil passage 9 connected to the first pressure regulating valve 14 and the second pressure regulating valve 12 and through which hydraulic oil is guided to the specified components for cooling and lubricating the specified components, the cooling and lubrication oil passage 9 being connected to an oil return port of the first pressure regulating valve 14 and an oil return port of the second pressure regulating valve 12, hydraulic oil flowing out of the driving pulley 2 and the driven pulley 4 being introduced into the cooling and lubrication oil passage 9 through the first pressure regulating valve 14 and the second pressure regulating valve 12, respectively, the hydraulic oil being guided to the specified components by the cooling and lubrication oil passage 9 for cooling and lubricating the components.
As shown in fig. 2, a first oil pressure sensor 16 for detecting the oil pressure is provided in the first pressure oil passage, the first oil pressure sensor 16 is mounted on the first pipe 15, a second oil pressure sensor 8 for detecting the oil pressure is provided in the second pressure oil passage, and the second oil pressure sensor 8 is mounted on the second pipe 10. Therefore, in order to ensure accurate control of the oil pressure of the first pressure oil path and the second pressure oil path, oil pressure sensors are respectively arranged on the two oil paths and used for detecting actual pressure in real time and ensuring accurate control of the pressure of the driving belt pulley 2 and the driven belt pulley 4.
In the present embodiment, as in the first embodiment, the oil pressure is output to the main oil passage 13 by the electric oil pump 7 to be respectively output to the two pressure regulating valves, and the pressure oil passage pressures of the driving pulley 2 and the driven pulley 4 are controlled by controlling the pressure regulating valves so that the meshing radii of the driving pulley 2 and the driven pulley 4 with the transmission belt 3 are continuously changed, that is, the change of the cone pulley axial positions of the driving pulley 2 and the driven pulley 4 by changing the pressures is realized, and the change of the transmission ratio is realized, that is, the stepless speed change is realized.
As shown in fig. 2, the power transmission mechanism includes a first gear 17 connected to the drive motor 1 and a second gear 11 meshed with the first gear 17 and connected to the continuously variable transmission mechanism, the first gear 17 and the second gear 11 are cylindrical gears, the diameter of the first gear 17 is smaller than that of the second gear 11, the first gear 17 is connected to the drive shaft of the drive motor 1, the second gear 11 is connected to the shaft of the drive pulley 2, and the second gear 11 rotates in synchronization with the drive pulley 2.
When a larger gear reduction ratio is needed, in the first embodiment, only one pair of gears are reduced, so that the diameters of the large gears of the pair of gears are required to be very large (the speed ratio is the ratio of the diameters of the gears), the whole box is large, and the problem of whole-vehicle structural arrangement is caused; in this embodiment, the power transmission mechanism also plays a role of reducing speed and increasing torque, and realizes speed reduction through the front and rear two groups of gears, and because the total reduction ratio is the product of the speed ratios of the two groups of gears, the diameter of the large gear can be reduced greatly by adopting a single group of gear ratios in this embodiment, so that the whole gearbox mechanism is more compact, and meanwhile, the rotating speed of the motor is input to the continuously variable transmission mechanism after being reduced through the first-stage reduction gear, so that the rotating speed of the input end of the continuously variable transmission can be effectively reduced, and meanwhile, the load of the input end of the continuously variable transmission is improved (because the working efficiency of the continuously variable transmission is better under the conditions of relatively low rotating speed, medium and high load), when the low-torque high-rotating speed motor system is adopted, the transmission efficiency of the continuously variable transmission system can be improved through the scheme, and the efficiency of the whole vehicle system is improved.
Example III
As shown in fig. 3, the present embodiment provides a continuously variable transmission system for an electrically driven vehicle, including a continuously variable transmission mechanism, a power transmission mechanism, and a hydraulic actuator system for adjusting a gear ratio of the continuously variable transmission mechanism. The continuously variable transmission mechanism comprises a driving belt pulley 2, a driven belt pulley 4 and a circular driving belt 3 which is arranged on the driving belt pulley 2 and the driven belt pulley 4; the hydraulic actuator system includes an oil pump 7, a first pressure oil path for guiding hydraulic oil to the driving pulley 2 and for adjusting the pulley groove width of the driving pulley 2, and a second pressure oil path for guiding hydraulic oil to the driven pulley 4 and for adjusting the pulley groove width of the driven pulley 4; the first pressure oil passage and the second pressure oil passage are connected to the oil pump 7, a first pressure regulating valve 14 for regulating the oil pressure is provided in the first pressure oil passage, and a second pressure regulating valve 12 for regulating the oil pressure is provided in the second pressure oil passage. The power transmission mechanism is used for realizing power transmission between the stepless speed change mechanism and the speed reduction mechanism, and is connected with the stepless speed change mechanism and the speed reduction mechanism.
As shown in fig. 3, the continuously variable transmission mechanism is a belt type continuously variable transmission, one end of a transmission belt 3 is wound on a driving pulley 2, the other end of the transmission belt 3 is wound on a driven pulley 4, the driving pulley 2 of the continuously variable transmission mechanism is connected with a driving motor 1, the driving pulley 2 receives power generated by the driving motor 1, the driven pulley 4 is connected with a speed reducing mechanism through a power transmission mechanism, the power transmission mechanism receives the power transmitted by the continuously variable transmission mechanism, the speed reducing mechanism is connected with a differential and plays a role of speed reduction and moment increase, the speed reducing mechanism is a primary gear mechanism and realizes power transmission, and the speed reducing mechanism comprises a speed reduction driving gear 5 connected with the power transmission mechanism and a speed reduction driven gear 6 fixedly arranged on a shell of the differential and meshed with the speed reduction driving gear 5. In the driving process of the driving motor 1, the power generated by the driving motor 1 is output to wheels through a stepless speed change mechanism, a power transmission mechanism, a speed reduction mechanism and a differential mechanism, stepless speed regulation can be realized through the stepless speed change mechanism, the low-speed dynamic performance of the whole vehicle is improved by enabling the stepless speed change mechanism to work in a large transmission ratio and outputting the amplified driving motor torque to the wheels when the driving motor 1 is in low speed, meanwhile, the motor rotation speed output is reduced by enabling the stepless speed change mechanism to work in a lower transmission ratio when the driving motor is in medium-high speed, so that the motor can work in a medium-low rotation speed high-efficiency area.
As shown in fig. 3, similarly to the first and second embodiments, the speed ratio of the continuously variable transmission mechanism is adjusted by a hydraulic actuator system that supplies hydraulic oil to the driving pulley 2 and the driven pulley 4 to adjust the groove widths of the driving pulley 2 and the driven pulley 4, thereby increasing or decreasing the winding radius of the transmission belt 3 and adjusting the speed ratio. For the driving belt wheel 2, after hydraulic oil enters the driving belt wheel 2, the groove width of a belt groove of the driving belt wheel 2 is reduced under the action of hydraulic pressure, and the winding radius of the driving belt 3 is increased; with the driven pulley 4, when hydraulic oil enters the driven pulley 4, the groove width of the pulley groove of the driven pulley 4 is reduced and the winding radius of the transmission belt 3 is increased by the hydraulic force. The speed change ratio of the continuously variable transmission is adjusted by continuously changing the winding radius of the transmission belt 3.
As shown in fig. 3, the first pressure regulating valve 14 is a two-position three-way electromagnetic valve, which has an oil inlet, an oil outlet and an oil return port, the first pressure oil path further includes a first pipe 15 connected to the first pressure regulating valve 14 and the driving pulley 2, the first pressure regulating valve 14 is used for regulating the oil pressure of the first pipe 15, one end of the first pipe 15 is connected to the oil outlet of the first pressure regulating valve 14, the other end of the first pipe 15 is connected to the driving pulley 2, the oil pump 7 is connected to the oil inlet of the first pressure regulating valve 14 through the main oil path 13, the hydraulic oil pumped by the oil pump 7 enters the first pressure regulating valve 14 through the main oil path 13, and the oil pump 7 is an electric oil pump. When the oil inlet and the oil outlet of the first pressure regulating valve 14 are in a communication state, the oil return port is closed, hydraulic oil entering the first pressure regulating valve 14 flows out of the oil outlet, and the hydraulic oil enters the driving belt wheel 2 through the first pipeline 15; when the oil return port of the first pressure regulating valve 14 is in a communication state with the oil outlet, the oil inlet is closed, hydraulic oil in the driving belt pulley 2 enters the first pressure regulating valve 14 through the first pipeline 15, the hydraulic oil entering the first pressure regulating valve 14 flows out of the oil return port, the driving belt pulley 2 discharges oil, the groove width of a belt groove of the driving belt pulley 2 is increased, and the winding radius of the driving belt 3 is reduced.
As shown in fig. 3, the second pressure regulating valve 12 is also a two-position three-way electromagnetic valve, which has an oil inlet, an oil outlet and an oil return port, the second pressure oil path further includes a second pipe 10 connected to the second pressure regulating valve 12 and the driven pulley 4, the second pressure regulating valve 12 is used for regulating the oil pressure of the second pipe 10, one end of the second pipe 10 is connected to the oil outlet of the second pressure regulating valve 12, the other end of the second pipe 10 is connected to the driven pulley 4, the oil pump 7 is connected to the oil inlet of the second pressure regulating valve 12 through a main oil path 13, and the hydraulic oil pumped by the oil pump 7 enters the second pressure regulating valve 12 through the main oil path 13. When the oil inlet and the oil outlet of the second pressure regulating valve 12 are in a communication state, the oil return port is closed, hydraulic oil entering the second pressure regulating valve 12 flows out of the oil outlet, and the hydraulic oil enters the driven belt pulley 4 through the second pipeline 10; when the oil return port of the second pressure regulating valve 12 is in a communication state with the oil outlet, the oil inlet is closed, hydraulic oil in the driven pulley 4 enters the second pressure regulating valve 12 through the second pipeline 10, the hydraulic oil entering the second pressure regulating valve 12 flows out from the oil return port, the driven pulley 4 discharges oil, the groove width of a pulley groove of the driven pulley 4 is increased, and the winding radius of the driving belt 3 is reduced.
As shown in fig. 3, the hydraulic actuator system further includes a cooling and lubrication oil passage 9 connected to the first pressure regulating valve 14 and the second pressure regulating valve 12 and through which hydraulic oil is guided to the specified components for cooling and lubricating the specified components, the cooling and lubrication oil passage 9 being connected to an oil return port of the first pressure regulating valve 14 and an oil return port of the second pressure regulating valve 12, hydraulic oil flowing out of the driving pulley 2 and the driven pulley 4 being introduced into the cooling and lubrication oil passage 9 through the first pressure regulating valve 14 and the second pressure regulating valve 12, respectively, the hydraulic oil being guided to the specified components by the cooling and lubrication oil passage 9 for cooling and lubricating the components.
As shown in fig. 3, a first oil pressure sensor 16 for detecting the oil pressure is provided in the first pressure oil passage, the first oil pressure sensor 16 is mounted on the first pipe 15, a second oil pressure sensor 8 for detecting the oil pressure is provided in the second pressure oil passage, and the second oil pressure sensor 8 is mounted on the second pipe 10. Therefore, in order to ensure accurate control of the oil pressure of the first pressure oil path and the second pressure oil path, oil pressure sensors are respectively arranged on the two oil paths and used for detecting actual pressure in real time and ensuring accurate control of the pressure of the driving belt pulley 2 and the driven belt pulley 4.
In the present embodiment, as in the first and second embodiments, the oil pressure is output to the main oil passage 13 by the electric oil pump 7 to be respectively output to the two pressure regulating valves, and the pressure oil passage pressures of the driving pulley 2 and the driven pulley 4 are controlled by controlling the pressure regulating valves so that the meshing radii of the driving pulley 2 and the driven pulley 4 with the transmission belt 3 are continuously changed, that is, the change of the cone pulley axial positions of the driving pulley 2 and the driven pulley 4 by changing the pressures is realized, and the change of the transmission ratio is realized, that is, the stepless speed change is realized.
As shown in fig. 3, the power transmission mechanism includes a first gear 17 connected with the continuously variable transmission mechanism and a second gear 11 meshed with the first gear 17 and connected with the reduction mechanism, the first gear 17 and the second gear 11 are cylindrical gears, the diameter of the first gear 17 is smaller than that of the second gear 11, the first gear 17 is connected with the shaft of the driven pulley 4, the first gear 17 rotates synchronously with the driven pulley 4, and the second gear 11 is fixedly connected with the reduction driving gear 5 in a coaxial manner.
When the driving motor adopted by the whole vehicle is a low-rotation-speed high-torque motor, (because the working efficiency of the continuously variable transmission is better under the conditions of relatively low-rotation-speed and medium-high load), compared with the second embodiment, the driving efficiency of the continuously variable transmission system can be enabled to work in the most efficient area because the rotation speed of the motor output is not further reduced, and meanwhile, the torque is further amplified (the working efficiency of the continuously variable transmission is deteriorated under the conditions of low-rotation-speed and high load), so that the efficiency of the whole vehicle system is improved.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (5)
1. An electrically-driven continuously variable transmission system for a vehicle, comprising:
The stepless speed change mechanism comprises a driving belt pulley, a driven belt pulley and a driving belt arranged on the driving belt pulley and the driven belt pulley;
A hydraulic actuator system including an oil pump, a first pressure oil passage for guiding hydraulic oil to the drive pulley and for adjusting a groove width of the drive pulley, and a second pressure oil passage for guiding hydraulic oil to the driven pulley and for adjusting a groove width of the driven pulley; the first pressure oil way and the second pressure oil way are connected with the oil pump, a first pressure regulating valve for regulating the oil pressure is arranged in the first pressure oil way, and a second pressure regulating valve for regulating the oil pressure is arranged in the second pressure oil way; and
A power transmission mechanism for effecting power transmission between the drive motor and the continuously variable transmission mechanism;
The continuously variable transmission mechanism is a belt type continuously variable transmission, one end of a transmission belt is wound on a driving belt pulley, the other end of the transmission belt is wound on a driven belt pulley, the driving belt pulley of the continuously variable transmission mechanism is connected with a driving motor through a power transmission mechanism, the power transmission mechanism receives power generated by the driving motor, the driving belt pulley receives the power transmitted by the power transmission mechanism, the driven belt pulley is connected with a differential mechanism through a speed reduction mechanism, the speed reduction mechanism plays a role in reducing and increasing moment, the speed reduction mechanism is a primary gear mechanism, the power transmission is realized, and the speed reduction mechanism comprises a speed reduction driving gear coaxially arranged with the driven belt pulley and a speed reduction driven gear fixedly arranged on a shell of the differential mechanism and meshed with the speed reduction driving gear;
In the driving process of the driving motor, the power generated by the driving motor is output to wheels through a power transmission mechanism, a stepless speed change mechanism, a speed reduction mechanism and a differential mechanism, and stepless speed regulation is realized through the stepless speed change mechanism;
The speed ratio of the stepless speed change mechanism is adjusted through a hydraulic execution system, the hydraulic execution system provides hydraulic oil for the driving belt pulley and the driven belt pulley, the groove width of the driving belt pulley and the driven belt pulley is adjusted, the winding radius of the driving belt is increased or decreased, and the speed ratio is adjusted; for the driving belt wheel, after hydraulic oil enters the driving belt wheel, the groove width of the belt wheel groove of the driving belt wheel is reduced under the action of hydraulic pressure, and the winding radius of the driving belt is increased; for the driven belt pulley, after hydraulic oil enters the driven belt pulley, the groove width of the belt pulley groove of the driven belt pulley is reduced under the action of hydraulic pressure, and the winding radius of the driving belt is increased; the speed change ratio of the continuously variable transmission mechanism is adjusted by continuously changing the winding radius of the transmission belt;
The first pressure regulating valve is a two-position three-way electromagnetic valve and is provided with an oil inlet, an oil outlet and an oil return port, the first pressure oil way further comprises a first pipeline connected with the first pressure regulating valve and the driving belt wheel, the first pressure regulating valve is used for regulating the oil pressure of the first pipeline, one end of the first pipeline is connected with the oil outlet of the first pressure regulating valve, the other end of the first pipeline is connected with the driving belt wheel, the oil pump is connected with the oil inlet of the first pressure regulating valve through a main oil way, hydraulic oil pumped by the oil pump enters the first pressure regulating valve through the main oil way, and the oil pump is an electric oil pump; when the oil inlet and the oil outlet of the first pressure regulating valve are in a communication state, the oil return port is closed, hydraulic oil entering the first pressure regulating valve flows out of the oil outlet, and the hydraulic oil enters the driving belt wheel through the first pipeline; when the oil return port of the first pressure regulating valve is communicated with the oil outlet, the oil inlet is closed, hydraulic oil in the driving belt wheel enters the first pressure regulating valve through the first pipeline, the hydraulic oil entering the first pressure regulating valve flows out of the oil return port, the driving belt wheel discharges oil, the groove width of a belt wheel groove of the driving belt wheel is increased, and the winding radius of the driving belt is reduced;
the second pressure regulating valve is also a two-position three-way electromagnetic valve and is provided with an oil inlet, an oil outlet and an oil return port, the second pressure oil way also comprises a second pipeline connected with the second pressure regulating valve and the driven belt pulley, the second pressure regulating valve is used for regulating the oil pressure of the second pipeline, one end of the second pipeline is connected with the oil outlet of the second pressure regulating valve, the other end of the second pipeline is connected with the driven belt pulley, the oil pump is connected with the oil inlet of the second pressure regulating valve through a main oil way, and hydraulic oil pumped by the oil pump enters the second pressure regulating valve through the main oil way; when the oil inlet and the oil outlet of the second pressure regulating valve are in a communication state, the oil return port is closed, hydraulic oil entering the second pressure regulating valve flows out of the oil outlet, and the hydraulic oil enters the driven belt wheel through the second pipeline; when the oil return port and the oil outlet of the second pressure regulating valve are in a communication state, the oil inlet is closed, hydraulic oil in the driven belt pulley enters the second pressure regulating valve through the second pipeline, the hydraulic oil entering the second pressure regulating valve flows out from the oil return port, the driven belt pulley discharges oil, the groove width of a belt wheel groove of the driven belt pulley is increased, and the winding radius of the driving belt is reduced.
2. The continuously variable transmission system for an electrically driven vehicle according to claim 1, characterized in that the hydraulic execution system further includes a cooling lubrication oil passage that is connected to the first pressure regulating valve and the second pressure regulating valve and that guides hydraulic oil to a specified component to cool and lubricate the specified component.
3. The continuously variable transmission system for an electrically driven vehicle according to claim 1, wherein a first oil pressure sensor for detecting an oil pressure is provided in the first pressure oil passage.
4. A continuously variable transmission system for an electrically driven vehicle according to any one of claims 1 to 3, wherein a second oil pressure sensor for detecting an oil pressure is provided in the second pressure oil passage.
5. The continuously variable transmission system for an electrically driven vehicle according to any one of claims 1 to 3, characterized in that the power transmission mechanism includes a first gear connected to the drive motor and a second gear meshed with the first gear and connected to the continuously variable transmission mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811645331.5A CN109611520B (en) | 2018-12-30 | Continuously variable transmission system for electrically driven vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811645331.5A CN109611520B (en) | 2018-12-30 | Continuously variable transmission system for electrically driven vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109611520A CN109611520A (en) | 2019-04-12 |
| CN109611520B true CN109611520B (en) | 2024-06-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204004265U (en) * | 2014-08-02 | 2014-12-10 | 山东交通学院 | A kind of hydraulic control system of composite automobile automatic transmission |
| CN209781588U (en) * | 2018-12-30 | 2019-12-13 | 芜湖万里扬变速器有限公司 | Continuously variable transmission system for electrically driven vehicle |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204004265U (en) * | 2014-08-02 | 2014-12-10 | 山东交通学院 | A kind of hydraulic control system of composite automobile automatic transmission |
| CN209781588U (en) * | 2018-12-30 | 2019-12-13 | 芜湖万里扬变速器有限公司 | Continuously variable transmission system for electrically driven vehicle |
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